Mainspring attachment for firearms.



No. 644,402. Patented Feb. 27 I900. M. BYE.

HAINSPSING ATTACHMENT FOR FIREARMS.

(Application filed Jan. 2, 1900.)

(No mm.)

I M'zqessei ,NiTED STATE MARTIN BYE, or WORCESTER,

MASSACHUSETTS, ASSIGNOR TO THE HAH- VIAINSPRIN-G ATTACHMENT FOR FlREABMS.

V SPECIFIG A TIQN forming part of Letters IPatent No. 644,402, dated February 27, 1900. v Application filed January 2,1900. Serial No. 62. (No model.) I

To all whom it may concern:

' Be it known that I, MARTIN BYE, a citizen of the United States, residing at Worcester,

' in the county-of Worcester and State of Massachusett's, have invented a new and useful Improvement in Mainspring Attachments for Firearms, of which the following, together with the accompanying drawings, is a speci: fication sufficiently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

My present invention relates to the improved construction of parts and manner of seating, supporting, and assembling the mainspring within the gun-frame, the objects being to provide means or facilities-whereby a coiled-wire 'mainspring may be readily assembled in the lock and at any time easily removed and reassembled by any person having occasion therefor without release of the spring tension and in a quick, simple, and convenient manner. I attain these objects by the mechanism illustrated in the drawings,

wherein- Figure 1 represents a longitudinal section of the frame of a gun constructed in accordance with my present invention; Fig. 2 is a similar View, but showing the parts as with the hammer pulled back. 'Fig. 3 is a transverse section of the frame at line X X on Fig. 2 looking toward the stock.v Fig. 4 is a horizontal section or plan, and Fig. 5 isan end view of the mainspring and-its stem as removed from the lock.

Referring to parts, A indicates the frame; 3, the coiled-wire mainspring; O, the pusherbar or spring-supporting stem ,i D, the discharging-hammer, pivoted at e, and F the trigger, which parts are relatively disposed in suitable manner, assho'wnr The rod or spring-supporting stem G'is-pro: v'ided with a head 0, that acts againstflzhe back of-th hammer as a pusher-rodin wellknown manner and having a shoulder 1,

against which the springB abuts, andtrans, verse ridges 2, that back of the hammer.

seat in grooves on the Near the rear end of said stem I provide a hole or opening 3, form ed transverse to the axis of the stem and preferably horizontal.

I Upon the frame A, at the rear end of the lock-chamber a, I form a bifu-rcated seat 5, forwardly projecting at about mid-height of the frame and having'between its side lugs a recess, vertical slot, or space 6, the width of which is sufficient forfreely receiving the rear end. of the spring-supporting stem' 0, while the end surface or shoulder 7 of said projection is fitted to serve as a seat against which the-spring B may take its bearing for exerting its thrust tension against the haminer through the stem 0, which follows the movement of the hammer, the rear end of the stem sliding between the seat-lugs'as the'ham' mer swings forward or backward,

In the fore end of the seat-lug 5 l'form a transverse recess or notch 9, which is preferably somewhat larger than the hole 3 in the stem. The hole 3 through the-stem is so lo; cated that it will approximately correspond in position with the notch or recess 9 when the hammer is drawn back to the full-cock.

At such position the hole 3 is in rear of the spring end, which latter is resting against the end 7 of the projecting seat 5.

The lock-chamber a is made with suilicient space beneath the springseat, as at 10, to permit the passage of the spring B and stem G into and out of the bifurcated seat 5 and into and from said chamber.

In the manufacture the coiled-wire mainspring B is placed upon the pusher-rod orstem 0 and compressed endwise thereon forgiving the required tension and until the end of the spring has passed the opening 3. Then a stop or wire pin 12 is thrust, through said opening (see Fig. at) and the spring is allowed to exert its expansive forceagainst said st'oppin. The spring and stem can then be handled as a single part. To assemble in the lock after the hammer is'in place, the head a isv in'tro duced-and placed against its spot onthe hammer-back and the rear end of the stem followed into the space .10 and thenraised vertically into the space 6 between the seat-lugs 5, so as to bringthe end'of the spring in front of the ends of tl'ie'seat surface 7 and the'pin 12 into alinement with the notch'i). The hammer is then swung back, which movement presses back the stem Q'eompressing the coilspring B against the seat 5fand relieving the I do ' the notch 9, then inserting the stop or wire pin-12,'and then allowing the hammer to swingforward.' This leaves the spring and stem free. Then the parts can be moved forward to clear the pin from the notch 9, the rear end of the stem dropped suificient to clear beneath the seat 5, and then removed laterally from the space 10, as will be understood.

The pin 12 through the opening 3 in the stem retains the tension of the spring-coil B and keeps thespring and stem in condition until the partsare reassembled in the frame, so that no resetting of a stiff coil-spring is required, and any person, as the user of a gun, can easily take out and-replace the spring and stem with comparative ease and convenient facility and without requiring'any special spring-straining tools for the operation. It will be understood that I do not claim, broadly, a coiled-wire mainspring and stem for operating a hammer in a firearm; but

What I claim as of my invention, and desire to secure by Letters Patent, is:- Y

1. In a firearm having a pivoted hammer,

a spirally-coiled wire mainsprin g and a spring supporting stem or push-bar embraced by said coiled spring and acting against the hammer; the combination with said spring and its stem, of a supporting-seat for the end of said spring provided with a slot or recess for the end of said stem, into and from which the stem can pass, a transverse opening in said stem adapt-ed for receiving a stop or pin, when the stem is at rearward position, as a means for retaining the'spring under tension upon the stem, and to permit free removal of the stem and spring when the hammer is dropped,

by the cooking of the hammer, for theppun pose set forth.

\Vitness my hand this 29th day of December, 1899. 'MARTIN BYE. Witnesses:

CHARLES S. BACON, I CHAS. H. BURLEIGHL 

